HUMIDITY — the amount of water vapour in the air. It is the most variable characteristic of the atmosphere and constitutes a …Britannica English vocabulary

FOG — cloud of small water droplets near ground level and sufficiently dense to reduce horizontal visibility to less than 1,000 m …Britannica English vocabulary

EMULSION — in physical chemistry, mixture of two or more liquids in which one is present as droplets, of microscopic or ultramicroscopic …Britannica English vocabulary

CLOUD — any visible mass of water droplets, ice crystals, or a mixture of both that is suspended in the air, usually …Britannica English vocabulary

MILLIKAN OIL-DROP EXPERIMENT — Millikan oil-drop experiment. Millikan oil-drop experiment. first direct and compelling measurement of the electric charge of a single electron. It …Britannica English vocabulary

CLIMATE AND LIFE — Climate and life Coevolution of climate and life It has been well established that life and climate interact and that …Britannica English vocabulary